From b1ddaa81f28b8bbc62d6d50526e0935b173099eb Mon Sep 17 00:00:00 2001 From: Patryk Niedźwiedziński Date: Sat, 17 Apr 2021 10:28:11 +0200 Subject: Init --- stdio/fopenflags.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 stdio/fopenflags.c (limited to 'stdio/fopenflags.c') diff --git a/stdio/fopenflags.c b/stdio/fopenflags.c new file mode 100644 index 0000000..268ea61 --- /dev/null +++ b/stdio/fopenflags.c @@ -0,0 +1,47 @@ +/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ +│vi: set net ft=c ts=8 sts=2 sw=2 fenc=utf-8 :vi│ +╞══════════════════════════════════════════════════════════════════════════════╡ +│ Copyright 2020 Justine Alexandra Roberts Tunney │ +│ │ +│ Permission to use, copy, modify, and/or distribute this software for │ +│ any purpose with or without fee is hereby granted, provided that the │ +│ above copyright notice and this permission notice appear in all copies. │ +│ │ +│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ +│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ +│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ +│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ +│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ +│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ +│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ +│ PERFORMANCE OF THIS SOFTWARE. │ +╚─────────────────────────────────────────────────────────────────────────────*/ +#include "libc/calls/calls.h" +#include "libc/stdio/stdio.h" +#include "libc/sysv/consts/o.h" + +/** + * Turns stdio flags description string into bitmask. + */ +int fopenflags(const char *mode) { + unsigned omode, flags; + omode = flags = 0; + do { + if (*mode == 'r') { + omode = O_RDONLY; + } else if (*mode == 'w') { + omode = O_WRONLY; + flags |= O_CREAT | O_TRUNC; + } else if (*mode == 'a') { + omode = O_WRONLY; + flags |= O_CREAT | O_APPEND; + } else if (*mode == '+') { + omode = O_RDWR; + } else if (*mode == 'x') { + flags |= O_EXCL; + } else if (*mode == 'e') { + flags |= O_CLOEXEC; + } + } while (*mode++); + return omode | flags; +} -- cgit 1.4.1